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1. Basis of Presentation and Use of Estimates Immaterial Errors Related to Presentation (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net Unrealized Holding Gain (Loss) Net Of Income Tax [Member]
          
Quantifying Misstatement in Current Year Financial Statements [Line Items]          
Quantifying Misstatement in Current Year Financial Statements, Amount $ 3,774 $ 31,196 $ 65,448 $ 12,663 $ 15,495
Income Tax On Net Unrealized Holding Gain (Loss) [Member]
          
Quantifying Misstatement in Current Year Financial Statements [Line Items]          
Quantifying Misstatement in Current Year Financial Statements, Amount 2,198 18,165 38,108 7,373 9,022
Reclassification Adjustments For Net Holding (Gain) Loss Net Of Income Tax [Member]
          
Quantifying Misstatement in Current Year Financial Statements [Line Items]          
Quantifying Misstatement in Current Year Financial Statements, Amount (170) (4,254) (5,045) 104 (385)
Income Tax on Reclassification Adjustments For Net Holding (Gain) Loss [Member]
          
Quantifying Misstatement in Current Year Financial Statements [Line Items]          
Quantifying Misstatement in Current Year Financial Statements, Amount (99) (2,477) (2,937) 61 (224)
Income Tax on Reclassification Adjustments For Net Holding (Gain) Loss [Member]
          
Quantifying Misstatement in Current Year Financial Statements [Line Items]          
Quantifying Misstatement in Current Year Financial Statements, Amount (198) (4,955) (5,874) 121 (448)
Reclassification Adjustments For Net Holding (Gain) Loss Net Of Income Tax [Member]
          
Quantifying Misstatement in Current Year Financial Statements [Line Items]          
Quantifying Misstatement in Current Year Financial Statements, Amount (340) (8,508) (10,090) 208 (770)
Income Tax On Net Unrealized Holding Gain (Loss) [Member]
          
Quantifying Misstatement in Current Year Financial Statements [Line Items]          
Quantifying Misstatement in Current Year Financial Statements, Amount (198) (4,955) (5,874) 121 (448)
Net Unrealized Holding Gain (Loss) Net Of Income Tax [Member]
          
Quantifying Misstatement in Current Year Financial Statements [Line Items]          
Quantifying Misstatement in Current Year Financial Statements, Amount $ (340) $ (8,508) $ (10,090) $ 208 $ (770)